Vulnerability-Lookup

GHSA-9H33-G3WW-MQFF

Vulnerability from github – Published: 2026-03-09 17:24 – Updated: 2026-03-10 18:43

Summary

Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

Details

Impact

A flaw in callback URL validation allowed crafted redirect_uri values containing URL userinfo (@) to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host.

Patches

Fixed in v2.3.1 (commit 3a339e33191c31b68bf57db907f800d9de5ffbc8). The fix replaces delimiter-based callback matching with structured URL pattern matching and updates validation logic/tests.

Workarounds

Reject callback URLs containing userinfo (@) at reverse proxy / app policy level if feasible.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/pocket-id/pocket-id/backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260228130835-3a339e33191c"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28512"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-09T17:24:27Z",
    "nvd_published_at": "2026-03-10T17:38:50Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nA flaw in callback URL validation allowed crafted `redirect_uri` values containing URL userinfo (`@`) to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host.\n\n### Patches\nFixed in `v2.3.1` (commit 3a339e33191c31b68bf57db907f800d9de5ffbc8).\nThe fix replaces delimiter-based callback matching with structured URL pattern matching and updates validation logic/tests.\n\n### Workarounds\n- Reject callback URLs containing userinfo (`@`) at reverse proxy / app policy level if feasible.",
  "id": "GHSA-9h33-g3ww-mqff",
  "modified": "2026-03-10T18:43:02Z",
  "published": "2026-03-09T17:24:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28512"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pocket-id/pocket-id"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion"
}

CVE-2026-28512 (GCVE-0-2026-28512)

Vulnerability from cvelistv5 – Published: 2026-03-09 22:17 – Updated: 2026-03-10 14:32

Title

Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

Summary

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. From 2.0.0 to before 2.4.0, a flaw in callback URL validation allowed crafted redirect_uri values containing URL userinfo (@) to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host. This vulnerability is fixed in 2.4.0.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-10 14:32 UTC

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/pocket-id/pocket-id/security/a…	x_refsource_CONFIRM
https://github.com/pocket-id/pocket-id/commit/3a3…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pocket-id	pocket-id	Affected: >= 2.0.0, < 2.4.0

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-28512",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-10T14:32:45.368003Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-10T14:32:52.265Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pocket-id",
          "vendor": "pocket-id",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.4.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. From 2.0.0 to before 2.4.0, a flaw in callback URL validation allowed crafted redirect_uri values containing URL userinfo (@) to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host. This vulnerability is fixed in 2.4.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-601",
              "description": "CWE-601: URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-09T22:17:58.425Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff"
        },
        {
          "name": "https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8"
        }
      ],
      "source": {
        "advisory": "GHSA-9h33-g3ww-mqff",
        "discovery": "UNKNOWN"
      },
      "title": "Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-28512",
    "datePublished": "2026-03-09T22:17:58.425Z",
    "dateReserved": "2026-02-27T20:57:47.710Z",
    "dateUpdated": "2026-03-10T14:32:52.265Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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